Imaging systems with clear filter pixels
US9191635B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2013 |
| Grant date | Nov 17, 2015 |
| Priority date | — |
| Expiry date | Jul 3, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2209/041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image sensor may have an array of image sensor pixels arranged in color filter unit cells each having one red image pixel that generates red image signals, one blue image pixel that generate blue image signals, and two clear image sensor pixels that generate white image signals. The image sensor may be coupled to processing circuitry that performs filtering operations on the red, blue, and white image signals to increase noise correlations in the image signals that reduce noise amplification when applying a color correction matrix to the image signals. The processing circuitry may extract a green image signal from the white image signal. The processing circuitry may compute a scaling value that includes a linear combination of the red, blue, white and green image signals. The scaling value may be applied to the red, blue, and green image signals to produce corrected image signals having improved image quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.